Due to the population growth and human activities in the agricultural and industrial fields, healthy and sanitary water has become scarce. Due to its high contamination load, environmental harms and water discharge standards, starch producing industry is regarded as one of the industries polluting water sources which its treatment and recovery remains important. In the present study, after fabrication of sequencing batch reactor (SBR), the effects of temperature, respiration depth, difference between sludge acclimation to organic matter (starch) and organic loading rate on reactor efficiency have been investigated. The experiments were designed using Design Expert Software and carried out in reactors named and which were acclimatized with 500 mg/l and 1500 mg/l organic substrates, respectively. Chemical oxygen demand (COD) removal percentage was measured as process response. According to the results, the experimental responses were in agreement with predicted models. In 25℃, the removal performance was high and it was 85.6% in average. In comparison with , the average COD removal efficiency was 12% higher in . The reactors performances in deep respiration were higher than middle and surface respiration. In optimal conditions, the COD removal efficiency was as high as 96.36%. Consequently, it is safe to note that sequencing batch reactor is an appropriate option for treating “starch-containing wastewater”.

[27] American Public Health Association (APHA), American Water Works Association, Water Environment Federation. (2005). "Standards methods for the examination of water and wastewater", 21st Edition, Washington, D.C.